USB hub



FIG. 1 is a top, front and left side perspective view of a USB hub, showing my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the USB hub in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a USB hub, as shown and described. 